Spraying device for applying mineral blacking to molds



Jan. 1 1929.

J. DEAN SPRAYING DEVICE FOR APPLYING MINERAL BLACKI NG TO HOLDS 2Sheets-Sheet 1 Filed March 51, 1927 21 .-i llll I h Jan. 1, 1929.1,697,167 J. DEAN SPRAYING DEVICE FOR APPLYING MINERAL BLACKING TO MOLDSFiled March 31, 1927 2 Sheets-Sheet 2 Fig. 1 20 55 54 52 In uenfor.

Patented l, 1929.

UNlT-ED STATES 1,697,167 PATENT OFFICE JAMES DEAN, OF STOGKPORT,ENGLAND.

SPRAYING DEVICE FOR APPLYING MINERAL BLAGKING '10 HOLDS.

Application filed March .31, 1927, Serial No. 179,891, and in GreatBritain January 13, 19 27.

This inventionrelates to devices for the application of mineral blackingto foundry molds. I

Hitherto such blacking, owingto 1ts being a liquid of thick consistencyliable very qulckly and easily separate into its solid and liquidconstituents, had to be swabbed on by hand or in some cases was appliedby a small spraying device adapted to contain only a very small quantityof blacking and operated by the user blowing therethrough with hismouth. This resulted in a considerable length of time being occupied inthe application of the blaoking, particularly vto large molds and in thecase of swab'bing rendered 'the molds readily liable to be damaged orsoiled by carelessness when applying the blacking. The said blackingcould not hitherto be economically sprayed onto molds by compressed airdevices havin spraying nozzles owing to the repeated '0 ogging of suchdevices.

I overcome these disadvantages by -the novel construction shown in theaccompanying drawings and hereinafter claimed. In

the said drawings Figure 1 is a plan view of a device for sprayingblacking.

Figure 2 is a view in vertical section on line 2-2 of Figure 1 regardedin the direction of arrow 1.

Figure 3 is a view in vertical section on line 3--3 regarded in thedirection of arrow 2. Figure 4 is a plan view in section of the sprayingnozzle of the device, the said nozzle being shown larger than in Figure1.

Referring to the drawings, in the construction shown therein, I providea cylindrical container 3 having handles 4 whereby it can be transportedand adapted to stand on the floor, the container 3 having asaucer-shaped bottom 5 provided with a central opening 6 which servesfor emptying and cleaning the interior of the container 3 and is closedby a screw-on cap 7, the cap 7 and opening 6' preferably forming a sumpin which sediment or grit can settle.

The top of the container 3 is provided with a conical filling opening 8surrounded by a funnel or tun-dish like part 9 adapted to guide theblacking to the filling opening 8 and having a sieve 1O hinged to it.The sieve 10 when in operative position lies below the top of thefunnel-like art 9 and the conical opening '8 is adapte to behermeticallygaged by pins 13 closed by means of a conical plug 11 havingbayonet-slot like parts 12 adapted to be enprovided on the top of theprojecting over the opening by the pins 13 when partially container 3and Sand be locked rotated.

In the top of the container 3 openings 14, 15 and 16 are provided aroundthe central filling opening 8. The opening 16 is con' trolled by anadjustable vent, for example in the form of a tap or cock 17 The opening15 serves to accommodate a pipe 18 which depends into the container 3 towithin a short distance of the bottom thereof and is connected, forexample by a flexible pipe 20 to the blacking connection 21 of thespraying nozzle. The opening 15'is hermetically closed round thedepending pipe 18. The opening 14 is connected to a compressed airsupply pipe 22 which'has a flexible portion 23 connected to a compressedair; connection 24 of i the spraying nozzle. A by-pass pipe 25, whichmay also be flexible is connected at one end to the compressed airsupply pipe 22 before the pipe 22 reaches the opening 14 and at theother end to the pipe 20 supplied with blacking from the depending pipe18. A cock 26 or'the like is provided in the compressed air supply pipe22 between the opening 14 and the point of connection of the bypass pipe25 and the by-pass pipe is provided with a cock 27.

The opening 14 is of comparatively small size and is preferably of thesame size as the sprayin hole'28, Figure 4, in the nipple 29 carried ythe cap 30 of the spraying nozzle.

The spraying nozzle is arranged so that the compressed air enters at therear and flows through a tube 31 in a straight'line direct to thespraying hole 28. The blacking 5 connection 21 is arranged atthe side ofthe nozzle and leads to a circular chamber 32 formed between the tube 31and the casing 32 and communicating with the central air passage 33 nearthe front end of the nozzle by 10 means of radial passages 34 providedin a hollow head 35 screwed into the tube 31 and forming a part of thecentral passage 33.

The interior of the head 35 is ofdarger diametcr than the interior ofthe tube 31, where 105 the radial passages 34 enter it and thereby formsan annular recess in the air passage 33 immediately adjacent thespraying hole 28.

In operation assuming that the container 3 has been filled by firstremoving the conical 110 lug 11, tippin 'the blacking into the funnelikepart 9 an allowing it to sieve through the sieve 10 into thecontainer 3,and then replacing the plug 11 to form an airtight closure, and theblacking to have then been allowed to stand for sometime, the solidconstituent or constituents of the blacking will have settled to thebottom of the container 3 and the liquid constituent or constituents ofthe blacking will be floating above the solid constituent orconstituents. The procedure is then as follows The cook 26 on the airsupply pipe 22 is closed, the vent 17 is opened and the cook 27 on theby-pass pi e is opened. Compressed air then flows i i'om the supply pipe22 through the by-pass pi e 25 and down the depending pipe 18 an byforcing its way through the blacking in the container 3 displaces thesettled constituent or constituents from around the bottom of thedepending pipe 18 and causes the said constituent or constituents to bethoroughly mixed with the liquid constituent or constituents in thevicinity of the pipe 18. Thus the blacking is brought into a conditionsuitable for passage through the pipe 18. The cock 27 on the bypass 25is now closed and the cook 26 on the air supply pipe 22 is opened.Compressed air is then able to flow direct from the supply pipe 22 tothe spraying nozzle through the pipe 23 and also into the container 3through the opening 14. By controlling the vent 17 a low, regulatableair pressure is set up in the container 3 to assist in causing theblacking to pass up the depending pipe 18 and along the pipe 20 to thespraying nozzle. The amount passing to the spraying nozzle is controlledby regulating the vent 1. When the blacking reaches the spraying nozzleit fills the annular chamber 32, oozes through the radial passages 34and fills the annular recess into whiththe passages 34 open, being thencaught by the stream of air which flows along the central passage 33 andpassing out of the spraying hole 28 with the said stream in the form ofa spray. Owing to the provision of the annular recess at the mouths ofthe passages 34 and the consequent accumulation of blacking mixture inthe said recess, the stream of air is prevented from drying up theblacking in the raidal passages 34 or at the mouths thereof and thuscausing a blocking of the passages 34. Owing to the proximity of thesaid recess to the spraying hole 28,- the blacking taken by the airstream from the said accumulation arrives outside of the nozzle beforethe air has time to dry it up. -Thus the possibility of clogging of thenozzle is eliminated or reduced.

As the blacking passes up the depending tube 18 an erosion of thesettled constituents which remained at a certain distance from thedepending pipe 18 takes place, this erosion being assisted by the flowor circulation in the become mixed to a uniform and correct consistencyready for passage up the depending tube 18 as spraying proceeds.

Should a choking of the pipe 20 or other part of the connection betweenthe depending tube 18 and the spraying nozzle or choking of the sprayingnozzle take place, such as when the device is stopped for a time, thecock 26 on the air supply pipe 22 is closed, the vent 17 is closed andthe cook 27 on the bypass pipe 25 is opened, whereupon the whole of thecompressed air acts on the pipe 20 and other parts of the saidconnection and forces the blacking along the same and out of thespraying nozzle, and thus removes the blockage.

By manipulating the cooks 26 and 27 and the vent 17, all of the pipes20, 23 and 25 can be cleaned out by the compressed air after the workhas been finished. Any undesirable sediment by settling to the lowermostpart of the container comes to lie in the sump formed by the opening 6and cap 7 and therefore does not interfere with the action of thedevice. It can be removed by screwing ofl the cap 7, whereupon theinterior of the corn tainer 3 can be emptied and cleaned out if desired,for example by sluicing or rinsing with water.

It will be observed that owing to the method provided in the said devicefor controlling the mineral blacking, the mineral blacking does not passthrough any controlling or regulating member such as a cock or valve,and

loo

that the said method of control therefore strongly conduces towards ablockage-free action of the device, and towards a nick and easy placingof the device into con ition for use when the mineral blacking has beenallowed to settle in and clog parts of the device. Notwithstanding theabsence of a control member or members from the spraying nozzle or theconnections through which the mineral blacking passes, the force of thespray and the amount of blacking contained therein can be adjusted tosuit different requirements, the adjustment being effected by means ofthe cook 26 and vent 17.

I claim:

1. In a spraying device for applying mineral blackin to foundry moldsand comprisingaminera blacking container, acompressed air supply pipeconnected to the container, and a compressed air control valve in thesaid pipe in a position which is in advance of its connection to thechamber, the combination of a valveless spraying nozzle, 2. comon thecontainer for controlling the working pressure therein, and a by-passpipe connected to the air supply pipe at a point thereof which is inadvance of the compressed air control valve and also connected to theend of the mineral blacking delivery pipe at a point which is in advanceof the connection of the mineral blacking delivery pipe with the saidcontainer.

2. In a spraying device for applying'mineral blacking to foundry moldsand comprising a portable container for the blacking, a compressed airsupply pipe connected to the container, control means provided on thesupply pipe in advance of its connection with the container, aregulatable air vent provided on the container, a compressed airdelivery pipe separate from the blacking delivery pipe but connected tothe said nozzle and supply pipe and controlled only by the said controlmeans, the combination of a non-elosable and nonregulatable blackingdelivery pipe non-closably and non-regulatably connected to thecontainer, a non-closable and non-regulatable spraying nozzle connectedto the said pipe, a clearing pipe connected to the supply pipe inadvance of the said control means and connected to the blacking deliverypipe in advance of its point of connection with the container, andcontrol means provided on'the clearing pipe adjacent the said point ofconnection.

3. A spraying device according to claim 1, wherein the spraying nozzlecomprises a straight central air passage connected at the rear of thenozzle to the compressed air delivery pipe and extending in anuninterrupted manner froni the rear to the front of the nozzle, acircular recess in the said passage immediately adjacent the front ofthe nozzle, a blacking chamber surrounding the said passage, radialblacking apertures provided in the said recess and forming the onlymeans of communication of the said chamber with the said passage and aspraying jet forming a direct continuation of the said recess.

4:. In a spraying device for applying mineral blacking to foundry moldsand comprising a mineral blacking container, a valve controlledcompressed air supply pipe connected to the container, a compressed airdeliver pipe connected to the compressed air supp y pipe, a separatemineral blacking delivery pipe independently connected to the container,a spraying nozzle connected to the compressed air delivery and mineralblacking delivery pipes and a controllable air vent on the container,the combination of a feed pipe depending into the container andconnected to the blacking delivery pipe with a branch pipe leadingdirect from a point in the compressed air supply pipe which is notaffected by the valve control to the upper end of the said feed pipe anda valve-on the branch pipe whereby compressed air can be driven at willdown the feed pipe only in con tra-direction to the flow of mineralblacking up'the said feed pipe.

In testimony whereof, I have signed my name to this specification atManchester, in the county of Lancaster, England, this 22nd day of March,1927.

JAMES DEAN.

